水稻品种对稻瘟病的质量抗性和数量抗性的初步研究

 选择三黄占2号等一些具有不同抗性水平的品种，从质量抗性和数量抗性两个方面探讨了不同类型抗性之间的关系。研究结果显示，三黄占2号等三个品种表现出稳定持久的抗性与其具有较高的质量抗性和数量抗性有关。结果表明，品种对病菌的抗性频率并不完全与品种的病斑数呈负相关，抗性频率和品种的病斑数可能受两种不同类型的抗性基因控制，反映出两种不同类型的抗性(质量抗性和数量抗性)。同时，也可看出，抗病品种的质量抗性与数量抗性水平必须以本地区的菌株与品种互作和环境条件反应的实际情况来综合评价。

Studies on the Qualitative and Quantitative Resistance of Rice Cultivars to Blast Disease

Nine rice cultivars were evaluated for blast resistance relatively to the partially resistant check IR36and the susceptible check B40,based on the measurement of resistant spectrum,lesion size,lesion density and diseased leaf area.Results indicated that three cultivars,namely Sanhuangzhan 2,Sanluzhan 7 and Meisanwu 2 appeared high qualitative and quantitative resistance either under artificial inoculation with 220 isolates of Guangdong Province or under a wide range of environmental diverse population of Pyricularia grisea, which may be considered to contribute the highly and stable blast resistance in different latitude in rice growing zone in China.But in some cases,the level of qualitative and quantitative blast resistance is not always positively correlated in the same cultivar.